diff --git a/src/lib/storage/checks.test.ts b/src/lib/storage/checks.test.ts
index c6b97ca2..af5a7e24 100644
--- a/src/lib/storage/checks.test.ts
+++ b/src/lib/storage/checks.test.ts
@@ -1,10 +1,30 @@
-import { hasMarkdownFileName } from './checks';
+import { hasMarkdownFileName, isPotentialZipFile } from './checks';
+
+const FILE_MD = 'abc.md';
+const FILE_TXT = 'def.txt';
+const FILE_MD_UPPER = 'cool.MD';
+
+const NO_EXTENSION = 'file';
+const ENDS_WITH_PERIOD = 'file.';
+const HAS_EXTENSION_ZIP = 'file.zip';
+const HAS_EXTENSION_TXT = 'file.txt';
+const HAS_EXTENSION_TAR_GZ = 'file.tar.gz';
+const ENDS_WITH_DOUBLE_PERIOD = 'file..';
 
 test('hasMarkdownFileName returns true', () => {
-  expect(hasMarkdownFileName(['abc.md', 'def.txt'])).toBe(true);
-  expect(hasMarkdownFileName(['cool.MD'])).toBe(true);
+  expect(hasMarkdownFileName([FILE_MD, FILE_TXT])).toBe(true);
+  expect(hasMarkdownFileName([FILE_MD_UPPER])).toBe(true);
 });
 
 test('hasMarkdownFileName returns false', () => {
-  expect(hasMarkdownFileName(['abc.txt', 'def.txt'])).toBe(false);
+  expect(hasMarkdownFileName([FILE_TXT, FILE_TXT])).toBe(false);
+});
+
+test('isPotentialZipFile identifies potential zip files', () => {
+  expect(isPotentialZipFile(NO_EXTENSION)).toBe(true);
+  expect(isPotentialZipFile(ENDS_WITH_PERIOD)).toBe(true);
+  expect(isPotentialZipFile(HAS_EXTENSION_ZIP)).toBe(false);
+  expect(isPotentialZipFile(HAS_EXTENSION_TXT)).toBe(false);
+  expect(isPotentialZipFile(HAS_EXTENSION_TAR_GZ)).toBe(false);
+  expect(isPotentialZipFile(ENDS_WITH_DOUBLE_PERIOD)).toBe(true);
 });
diff --git a/src/lib/storage/checks.ts b/src/lib/storage/checks.ts
index 723477f9..5b7aafca 100644
--- a/src/lib/storage/checks.ts
+++ b/src/lib/storage/checks.ts
@@ -32,5 +32,6 @@ export const isPDFFile = (fileName: string) => /.pdf$/i.exec(fileName);
  * @param filename
  * @returns
  */
-export const isPotentialZipFile = (filename: string): boolean =>
-  !filename.includes('.');
+export const isPotentialZipFile = (filename: string): boolean => {
+  return filename.trim().endsWith('.') || !filename.includes('.');
+};